Heating element



Apr. 24, 1923. 1,452,989

N. F. STRAUSS HEATING ELEMENT Filed April '26 1921 I NVEA TOR NurhertF Et GUS 5 A TTORNEYS.

Patented Apr. 24, 1923.

UNITED STATES 1,452,989 PATENT OFFICE.

NORBERT F. STRAUSS, OF MILWAUKEE, WISCONSIN, ASSIGNOR T0 MILWAUKEE MANU- FACTURING, 60., 0F MILWAUKEE, WISCONSIN.

HEATING ELEMENT.

Application filed April 26, 1921.

T 0 all whom it may concern:

Be it known that I, NORBERT F. STRAUSS, a citizen of the United States, and resident of Milwaukee, in'the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Heating Elements; and Idohereby declare that the following is a'full, clear, and exact descri tion thereof.

y invention relates to a new and improved heating element, and more especially to that type which is adapted to be immersed in a liquid, and in which the liquid acts as a conductor between the electrodes;

Hitherto it has been customary to construct heating elements of this kind, in which the electrodes were all composed of metal and consequently when the device was immersed in a liquid,-the passage of the electric current set up a chemical action which resulted in considerable corrosion of the electrodes, and at the same time the dissolution of a portion of the metallic oxides or salts polluted the liquid.

One of the principal objects of my invention is to improve the construction of this type of heating element, so that there will be no possibility of corrosion, and consequently deterioration of the efficiency of the device or the pollution of the liquid in which it is used.

A further object ofthe invention is to retain all the essential functions of the metal electrode without the disadvantages thereof.

With the above and other objects in view which will be apparent from the following description, my invention consists in structural details which are illustrated in the accompanying drawing, in which- Figure 1 is a side elevation of my imroved heating element'with portions shown in section, aiid Figure 2 is a horizontal sectional plan view on the line of. Figure 1.

The device of which my invention forms a part comprises a cylindrical cage or housing 5, which is provided with numerous openings 6, through which the liquid may readily circulate when the element is immersed therein. A supportin member 7 which is in the nature of a p ug is screw threaded into the u per end of the cylindrical housing, and fbrms a support for the electrodes 8. Each of these electrodes comprises a fiat strip of carbon extending longitudinally of the housing, embedded in the Serial No. 464,657.

center of which is a metal core or tie-rod 9.

These electrodes are arranged in the usual manner with flat faces parallel to each other. The ends of the carbon strips are secured in headers 10 and 11 of insulating material, kerfs 12 being provided to receive the same. The lower ends of the rods 9 extend through the header 11 and are secured thereto by the nuts 13. The upper ends of the rods 9 pass through the header 10, and the insulating sleeves 14 of the plug 7, and are secured by the nuts 15. The ends of the rods 9 form binding posts to which the wires of the electric circuit are connected.

The headers 10 and 11 are made of a diameter to fit snugly the inside of the housing,

and in assembling the device they are inserted therein and the plug 7 is screwed into the end thereof.

It will be noted that the cores 9 are entirely protected from contact with the liquid in which the element is immersed by the carbon strips 8 and the header elements 10 and 11. The metal cores 9, however, extend throughout the entire length of'the heating element, so that the electric potential is practically the same throughout the entire opposing surfaces of the electrodes, the carbon strips which alone would be quite brittle are fully protected by the reinforcement provided by the metallic cores.

I claim as my invention:

1. heating element for liquids comprising a housing having openings therein, electrodes supported at one end of the housing and each having a metal core and a carbon covering therefor, and means for connecting said electrodes to an electric circuit.

2. A heating element for liquids comprising a housing having openings therein, a plug adapted to be secured in one end of the housing, electrodes supported at one end in said plug and each having a metal core and a carbon coverin therefor, and means for'connecting said e ectrodes to an electric circuit.

3. A heating element for liquids comprising a housing having openings therein, electrodes supported at one end of the housing and each having a metal core and a carbon covering therefor, insulatin headers in which the ends of the electro es are secured in spaced relation, and means for connecting said electrodes to an electric circuit.

4.. A heating element for liquids comprisill ing a housing having openings therein, a plug secured in one end of the housing, electrodes secured at one end in the plug and each having a metal'rod and flat carbon strips in which said rods are embedded, insulating headers fittin within the housing and having transverse parallel opposed lrerfs in which the ends ofsaid carbon strips are secured, said metal rods extending longitudinally through the strips and through the headers, and having means on their outer ends for holding said headers in engagement with the carbon strips, and means for connectin said electrodes to an electric circuit.

5. T ie combination of a cylindrical housing having openings therein, an insulated header in said housing adjacent one end thereof, a carbon electrode, a support contacting with said header having screwthreaded relation to the end of said housing, a carbon electrode terminating in said header, and a metallic core extending throughout the length of said electrode and projecting beyond the end thereof through said header and secured to said support.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of Milwaukee and State of Wiscousin.

' NORBERT F. STRAUSS. 

